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Anand D Shah, Mike A Morris, David S Hirsh, Megan Warnock, Yijian Huang, Mike Mollerus, Faisal M Merchant, Anshul M Patel, David B Delurgio, Adarsh U Patel, Michael H Hoskins, Mikhael F El Chami, Angel R Leon, Jonathan J Langberg, Michael S Lloyd
BACKGROUND: Recommendations regarding performance of MRI in non-MRI conditional pacemaker and defibrillator recipients are evolving. Previous studies suggest low adverse event rates with MRI in non-conditional CIED recipients, but low power limits optimal characterization of risk. OBJECTIVE: In order to improve power, a systematic review and meta-analysis was performed to characterize the clinical risk associated with MRI in CIED recipients. METHODS: PUBMED and CINAHL indexed articles from 1990-2017 were queried...
February 16, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Yu-Hai Gao, Yan-Feng Zhou, Shao-Feng Li, Wen-Yuan Li, Hui-Rong Xi, Fang-Fang Yang, Ke-Ming Chen
OBJECTIVE: To study effects of 50 Hz 1.8 mT sinusoidal electromagnetic fields (SEMFs) on bone mineral density (BMD) in SD rats. METHODS: Thirty SD rats weighted(110±10) and aged 1 month were randomly divided into control group and electromagnetic field group, 15 in each group. Normal control group of 50 Hz 0 mT density and sinusoidal electromagnetic field group of 50 Hz 1.8 mT were performed respectively with 1.5 h/d and weighted weight once a week, and observed food-intake...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Seyed Ali Reza Mortazavi, Seyed Mohammad Javad Mortazavi
Breast cancer is the most common malignancy among women, both in the developed and developing countries. Women with mutations in the BRCA1 and BRCA2 genes have an increased risk of breast and ovarian cancers. Recent studies show that short-wavelength visible light disturb the secretion of melatonin and causes circadian rhythm disruption. We have previously studied the health effects of exposure to different levels of radiofrequency electromagnetic fields (RF-EMFs) such as mobile phones, mobile base stations, mobile phone jammers, laptop computers, and radars...
February 2018: Iranian Journal of Basic Medical Sciences
Peter J Gwynne, Maurice P Gallagher
Antimicrobial resistance is a significant and growing concern. To continue to treat even simple infections, there is a pressing need for new alternative and complementary approaches to antimicrobial therapy. One possible addition to the current range of treatments is the use of narrow-wavelength light as an antimicrobial, which has been shown to eliminate a range of common pathogens. Much progress has already been made with blue light but the potential of other regions of the electromagnetic spectrum is largely unexplored...
2018: Frontiers in Microbiology
Bu S Park, Brent McCright, Leonardo M Angelone, Amir Razjouyan, Sunder S Rajan
This study investigates the use of pads with high dielectric constant (HDC) materials to alter electromagnetic field distributions in patients during magnetic resonance imaging (MRI). The study was performed with numerical simulations and phantom measurements. An initial proof-of-concept and validation was performed using a phantom at 64 MHz, showing increases of up to 10% in electromagnetic field when using distilled water as the high dielectric material. Additionally, numerical simulations with computational models of human anatomy were performed at 128 MHz...
October 2017: IEEE Transactions on Electromagnetic Compatibility
Na Chen, Jian-Tang Jiang, Cheng-Yan Xu, Shao-Jiu Yan, Liang Zhen
Core-shell particles with integration of ferromagnetic core and dielectric shell are attracting extensive attention for promising microwave absorption applications. In this work, CoNi microspheres with conical bulges were synthesized by a simple and scalable liquid-phase reduction method. Subsequent coating of dielectric materials was conducted to acquire core-shell structured CoNi@TiO 2 composite particles, in which the thickness of TiO 2 is about 40 nm. The coating of TiO 2 enables the absorption band of CoNi to effectively shift from K u to S band, and endows CoNi@TiO 2 microspheres with outstanding electromagnetic wave absorption performance along with a maximum reflection loss of 76...
February 16, 2018: Scientific Reports
Xiaowei Li, Hiro Minamimoto, Kei Murakoshi
The vibrational characteristics of ligand-capped lead sulfide (PbS) quantum dots (QDs) were clarified via electrochemical surface-enhanced Raman spectroscopy (EC-SERS) using a hybridized system of gold (Au) nanodimers and PbS QDs under electrochemical potential control. Enhanced electromagnetic field caused by the coupling of QDs with plasmonic Au nanodimers allowed the characteristic behavior of the ligand oleic acid (OA) on the PbS QD surface to be detected under electrochemical potential control. Binding modes between the QDs and OA molecules were characterized using synchronous two-dimensional correlation spectra at distinct electrochemical potentials, confirming that the bidentate bridging mode was probably the most stable mode even under relatively negative potential polarization...
February 7, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Lisa V Brown, Marcelo Davanco, Zhiyuan Sun, Andrey V Kretinin, Yiguo Chen, Joseph Robert Matson, Igor Vurgaftman, Nicholas Sharac, Alexander Giles, Michael M Fogler, Takashi Taniguchi, Kenji Watanabe, Kostya S Novoselov, Stefan A Maier, Andrea Centrone, Joshua D Caldwell
The inherent crystal anisotropy of hexagonal boron nitride (hBN) provides the ability to support hyperbolic phonon polaritons, i.e. polaritons that can propagate with very large wavevectors within the material volume, thereby enabling optical confinement to exceedingly small dimensions. Indeed, previous research has shown that nanometer-scale truncated nanocone hBN cavities, with deep subdiffractional dimensions, support three-dimensionally confined optical modes in the mid-infrared. Due to optical selection rules only a few of the many theoretically predicted modes have been observed experimentally via far-field reflection and scattering-type scanning near-field optical microscopy (s-SNOM)...
February 16, 2018: Nano Letters
Pavan Kumar Challa, Quentin Peter, Maya A Wright, Yuewen Zhang, Kadi-Liis Saar, Jacqueline A Carozza, Justin L P Benesch, Tuomas P J Knowles
Optical detection has become a convenient and scalable approach to read out information from microfluidic systems. For the study of many key biomolecules, however, including peptides and proteins, which have low fluorescence emission efficiencies at visible wavelengths, this approach typically requires labelling of the species of interest with extrinsic fluorophores to enhance the optical signal obtained -- a process which can be time-consuming, requires purification steps, and has the propensity to perturb the behaviour of the systems under study due to interactions between the labels and the analyte molecules...
February 16, 2018: Analytical Chemistry
NaRi Seo, Sung-Ho Lee, Kyung Won Ju, JaeMan Woo, BongJu Kim, SoungMin Kim, Jeong Won Jahng, Jong-Ho Lee
Bone marrow-derived mesenchymal stem cells (BMSCs) have been shown to promote the regeneration of injured peripheral nerves. Pulsed electromagnetic field (PEMF) reportedly promotes the proliferation and neuronal differentiation of BMSCs. Low-frequency PEMF can induce the neuronal differentiation of BMSCs in the absence of nerve growth factors. This study was designed to investigate the effects of low-frequency PEMF pretreatment on the proliferation and function of BMSCs and the effects of low-frequency PEMF pre-treated BMSCs on the regeneration of injured peripheral nerve using in vitro and in vivo experiments...
January 2018: Neural Regeneration Research
Shang-Shu Ding, Ping Sun, Zhou Zhang, Xiang Liu, Hong Tian, Yong-Wei Huo, Li-Rong Wang, Yan Han, Jun-Ping Xing
Background: The worsening of semen quality, due to the application of Wi-Fi, can be ameliorated by Vitamin E. This study aimed to demonstrate whether a moderate dose of trolox, a new Vitamin E, inhibits oxidative damage on sperms in vitro after exposure to Wi-Fi radiation. Methods: Each of the twenty qualified semen, gathered from June to October 2014 in eugenics clinic, was separated into four aliquots, including sham, Wi-Fi-exposed, Wi-Fi plus 5 mmol/L trolox, and Wi-Fi plus 10 mmol/L trolox groups...
February 20, 2018: Chinese Medical Journal
Lu Zhao
Based on electromagnetically induced transparency (EIT), we investigate an all-optical grating structure to realize polarization-dependent multiple beam splitting in the Raman-Nath limit. To optimize the grating performance, higher excited state [e.g., nS 1/2 (n ≥ 6)] of ultracold 87 Rb atoms is employed to construct a five-level Ξ-Λ system sharing one common populated ground state. A principal advantage of our proposed scheme is that the σ ± components of a linearly polarized weak probe field can be decoupled and thus be independently diffracted with high efficiency in both one and two dimensions by exploiting different quasi-standing waves as the two strong coupling fields in the Ξ and Λ configurations...
February 15, 2018: Scientific Reports
Ying Tang, Song Xu, Ping Ao
Quantifying the escape rate from a meta-stable state is essential to understand a wide range of dynamical processes. Kramers' classical rate formula is the product of an exponential function of the potential barrier height and a pre-factor related to the friction coefficient. Although many applications of the rate formula focused on the exponential term, the prefactor can have a significant effect on the escape rate in certain parameter regions, such as the overdamped limit and the underdamped limit. There have been continuous interests to understand the effect of non-detailed balance on the escape rate; however, how the prefactor behaves under strong non-detailed balance force remains elusive...
February 14, 2018: Journal of Chemical Physics
Soo Kyung Lee, Hee-Jin Lim, Chee Leong Tan, Yong Tak Lee
We present a light trapping structure consisting of gold and silver (AuAg) bimetallic non-alloyed nanoparticles (BNNPs) on a silicon dioxide (SiO2) spacer layer over crystalline silicon (c-Si) film, designed to improve the absorption of thin-film c-Si solar cells. Prior to fabrication of the AuAg BNNPs on the SiO2 spacer layer, numerical investigations were carried out using electromagnetic field simulation following the finite-difference time-domain method. The hemispherical Au8Ag8 BNNPs were fabricated and deposited on a 15 nm-thick SiO2 spacer layer, which enhanced light trapping in the c-Si film over a broad wavelength range (450-1100 nm)...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Jian Wei, Qian Zhang, Lili Zhao, Zhengbo Nie, Lei Hao
The uniform ultra-long SiC nanowires (SiCNWs) were incorporated into the epoxy matrix to characterize the morphology effect on their electromagnetic wave absorption performance. The ultra-long SiCNWs with lengths of hundreds of micrometers were fabricated by chemical vapor deposition technique at 1250 °C, and have diameters of 10-60 nm with uniform morphologies. The microwave absorption performance of SiCNW/epoxy resin composites was investigated in the range of 8-18 GHz. Significant absorbing properties were discovered in the composites at frequencies of 8-12...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Heidy Cruz, Younggon Son
Since the discovery of carbon nanotubes (CNT), significant research works have focused on the application of CNT as conductive filler to polymer nanocomposites which can be used in several fields such as electrostatic dissipation (ESD), electrostatic painting and electromagnetic interference shielding (EMI-shielding). However, the main challenge in the large-scale manufacturing of this technology is the poor electrical conductivity of polymer nanocomposites produced by injection molding process. This study aims to investigate the effect of CNT aspect ratio in improving the electrical conductivity of injection molded nanocomposites...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Olivia A Attallah, W K B Khalil, Mohamed M S Abdel Mottaleb, E Girgis
In our present work some biological tests were carried out to assess the biocompatibility of nicotinic acid coated magnetite nanorods. Pure and coated nanorods were injected intraperitoneally to cholesterol fed mice with dose values of 25, 50 mg/Kg. Investigations were done on treated mice with/without exposure to low frequency electromagnetic field (EMF) and samples were collected fourteen days post treatment. Toxicological effects were evaluated using Micronucleus and DNA fragmentation analysis. The results indicated that low dose (25 mg/Kg) nicotinic acid coated nanorods had insignificant toxicological effects in comparison to that of control group...
February 1, 2018: Journal of Nanoscience and Nanotechnology
A Poyé, S Hulin, M Bailly-Grandvaux, J-L Dubois, J Ribolzi, D Raffestin, M Bardon, F Lubrano-Lavaderci, E D'Humières, J J Santos, Ph Nicolaï, V Tikhonchuk
This corrects the article DOI: 10.1103/PhysRevE.91.043106.
January 2018: Physical Review. E
M A Griffith, M A Continentino
Topological phase transitions constitute a new class of quantum critical phenomena. They cannot be described within the usual framework of the Landau theory since, in general, the different phases cannot be distinguished by an order parameter, neither can they be related to different symmetries. In most cases, however, one can identify a diverging length at these topological transitions. This allows us to describe them using a scaling approach and to introduce a set of critical exponents that characterize their universality class...
January 2018: Physical Review. E
Michael A Klatt, Salvatore Torquato
In the first two papers of this series, we characterized the structure of maximally random jammed (MRJ) sphere packings across length scales by computing a variety of different correlation functions, spectral functions, hole probabilities, and local density fluctuations. From the remarkable structural features of the MRJ packings, especially its disordered hyperuniformity, exceptional physical properties can be expected. Here we employ these structural descriptors to estimate effective transport and electromagnetic properties via rigorous bounds, exact expansions, and accurate analytical approximation formulas...
January 2018: Physical Review. E
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